With this dino and a friend you can tame any flying mount that will attack you back. Have 1 friend in the back seat and another flying and shoot the creature you want. When it starts attacking have the driver fly forwards while the friend on the back shoots. You can get tons of argentavis's and snow owls using this technique.
This Dino is my favorite on the island for various reasons. First, it can hold 2 passengers, a pilot, and carry another. Second, it is the most maneuverable flyer out there. It can fly sideways, backwards, and can land on vertical surfaces (cliffs, redwoods.) Third, it has a tek saddle, so you can have four dubs on that thing (tek saddle, 2 passengers, and one carried person.)
you don’t need to upgrade it’s stamina, if you are in the air and it’s stamina is low, just get in the back seat and wait for it’s stamina to recover, no need to land, if you don’t whistle it to follow, it will land automatically. I hope this helps :)